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Perfect! Thanks

I'm looking at building a 2p4s battery in this configuration. I was wondering if I could make the top and bottom buss bars from a single piece of copper rather than making individual cell to cell buss bars. The only down fall I could think of would be expansion and contraction of the cells but I...

I also didn't charge to 3.65v so the capacity loss is not all from 3.0-2.5v range. I think the temp played more into my numbers than I first thought as I'm testing in an uncontrolled garage and had outdoor temp ranges from 80-20*f for them two weeks.

Read everything I wrote. The test was how I was going to use them from 3.5-3.0v NOT 3.65-2.5v my cell tests from 3.6-2.5 were all over 230ah. Yes docan. I also think temp has a large part in cell testing. If I ever do more testing I will most likely set up a temp controlled box (cooler) to have...

I'm doing about the same setup 2p4s 230ah cells. I don't trust the ir readings of my tester. But I recently got an EBC-A40L and I've been capacity testing the cells individually and matched in pairs. My plan is to pair lower capacity cells with higher capacity cells to create as close to matched...

shipped or not? with shipping that's a deal.

3x8= 24 I don't understand what the problem is? Make your own buss bars from copper strips

no 3p 8S for 24v and yes 1 bms for the pack

IMO the best way to do this is to capacity test each cell on its own then pair up the 3 cells in parallel so you have 4 packs of equal capacity. Then connect in series.

insightful

I should have defined this better. Same capacity cells. I've just done my own testing on the cells so say they are 230ah cells. One maybe 232ah to say 228ah.

Does anyone have insight on what is the best order of placing cells when say wiring a 4s pack. If I have 4 cells of different capacity should I put the highest two capacity in the middle of the pack, on the outsides or ??

depends on what open ports you have on your BMS

Thanks for the info! I have a capacity tester but not sure if I have the time to test all of them separately. I will for sure top balance!

Looking at making a 12v 460ah pack from 8 230ah cells. Any problems or pitfalls in doing that?

JBD sells a small wired screen using the RS485 or uart port https://www.aliexpress.com/item/1005002398930415.html?spm=a2g0o.detail.1000023.11.65047de6V2zXMR

They will fit in a group 24 box with a little room to spare for the BMS

thanks for the info!

who is Amy working for these days? My old messages from her switched over to some other lady at xuba

Yes! Best thing ever made! you can basically make darn near anything you can make in an oven or grill. Pizza, steak, fries, tater tots, cookies, cinnamon rolls...

I run my ice fishing trailer off of a 560ah battery i built (4s2p). It works great! I've been able to boondock for a week without charging at all. that's running my 2kw diesel heater in sub freezing temps. I also have a 2000 watt inverter and do all my cooking on a pizza oven. Also run my tv and...

I have kind of a simular need in one of my small trailers. I decided not to go with an inverter charger because I've been burned in the past with all in one type devices. Plus with my batteries I want to choose when they get charged or not. So I have my charger on a switched outlet that I can...

I've wondered the same thing but got no answer for you other than I think I would side with your friend on putting lower resistance cells inside the pack.

I have two 280ah 12v packs paralleled in my trailer. I run a seperate 4s 120amp BMS for each pack. I run a 2000 watt inverter from it. It works great for me. IMO the only other way to get around using only 1 BMS is to have one that controls a large contactor. The Eve 280ah cells fit nicely into...

you have a Life setting on that charger--- use it! put your pack together and charge with your 12v charger, then pull it apart and top charge each cell with your rc charger. I do it all the time. or you can put the pack in parallel and top charge all together.

Got them all packed up an top charged, waiting on crimp terminals

Here's the problem with your idea. not everyone has a 3d printer to print something like this especially for a 280ah cell. Second the performance of PLA isn't up for the task. 3rd an injected molded part is going to be costly just because of the mold needed $20-30,000. Forth the cell variation...

I got the Samlex SSW-2000-12a It performs well and handles my 1500watt load just fine, the only complaint is the fans are loud. I do reccomend buying from https://www.donrowe.com if you are in the US. I got their fuse holder, fuse and their 1/0 cables and their stuff is very nice quality and...

I currently have a 12v 560ah battery setup in my trailer, just spend 5 days running off of it and I'm very pleased with the performance of these cells. when I looked at the cells they remained sub 0.01v for cell balance even while pulling 60+ amps. My avg temp was around 55*F, I also let my...

It’s not very difficult to get some 12v heating pads and a temp controller. If you are really worried about it.

Thanks for the input. I have a resistance tester but I find it’s not very repeatable so (it does read SOC good) I think the best way for me to match is do some test cycles of them and match that way.

My plans changed for some cells I have and I’d like to put them into my rv. I’d rather not go 24v right now and stay with 12v. That said I have 16 90ah cells and 4 bms’s on hand. I won’t exceed the current draw even for one bms so there’s multiple ways I could go. My first thought is just make 4...

Buy a RC battery charger from a hobby store. Most all of them have mutiple charge profiles as well as balance charging. Connect your all in one solar charger to do the bulk charging your BMS will shut off when the first cell goes too high. Then pull part the pack and top charge the rest of the...

Thanks all for the input I decided to go with the Samlex

Found this xantrex model that fits in that price range. So now to decide this or the samlex https://www.hodgesmarine.com/xan806-1220-xantrex-prowatt-sw2000-2000w-true-sinewave-inverte.html